Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dd2cbb49b2309f9…

MALICIOUS

PDF

86.2 KB Created: 2021-07-05 16:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: fe98558adfc252572d774f8a5c9f6555 SHA-1: 84b363062e086124c8ef56eb3987ff07378584e9 SHA-256: 6dd2cbb49b2309f996e412e18ad0da5665b91649e2a3b314b92030153a4eeeec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that form a link farm, directing users to compromised WordPress upload sites and other disposable hosting. The primary function appears to be redirecting users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://laborke.ru/uplcv?utm_term=crows+bring+gifts+to+little+girl PDF link annotation
    • http://gld-lining.com/user_img/files/dirozuzuritutifetamotaso.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/40ee889c291e58880af876f887029188/vuminemirut.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/91057085186.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/cckc22fpcs080a6tct681arr7k/vufowefep.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/71325500166.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/buzogaleniwoteme.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/074b1b856abefe1c1ad0b79205571b6c/pefob.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607687572bfa6---ranonoxuzenewevi.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/9961c1008d9c87341dbbf3115c177856/nedisakakudotabefexurem.pdfIn PDF document text
    • http://abnicum.com/files/file/buzijiwewuni.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/50780337974.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215141242345068.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/zogukem.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/9422110b0e23eb92b786ae553b00f0e4/porojokafagogazolasebew.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3780e503f---33441592171.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/51305786791.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/960b7c0dc03149357e22bfd75fad2205/13197669346.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/51680103322.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/54037093926.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a378a270360---tebufaxozofugipugebeg.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/flagilokvfu464kis3c90u5d11/gatepikusu.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/83810312564.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/14548741242.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160721c4b68642---51484781424.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c080f9f1567---73636735702.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10640 17500 bytes
SHA-256: 7a97364829856e82093a4c3203e9696f3de5c8b5e15fb1f4e8f36f4d118f2a76
font_02_sfnt_off00013373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13373 10484 bytes
SHA-256: 7514c0ac53c6a1bf5bd4c48f99e9b5f37a61b6a915d035f97ce325e79bdc244c